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Swing arm profilometer： improving the testing accuracy of large mirrors with shorter arms

Chinese Optics Letters 2014年第A2期12卷 111-116页

作者：罗霄 Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanical and Physics CAS Changchun 130033 China

Swing arm profilometer is a useful metrology tool for large optics. For larger mirrors, the testing accuracy decreases as the arm becomes longer, while the testing accuracy requirement remains the same. We introduce a simple solution to make testing of large mirrors with shorter arms possible, which improves the testing accuracy, especially reduces the uncertainty of low-order shapes like astigmatism and trefoil. Simulation and experiment results show that testing uncertainty of low-order shape and high-frequency errors reaches 0.1 μm RMS, which faithfully meets the requirement of profile testing to guide the grinding and coarse polishing process.

关键词： 220.1250 Aspherics 220.4610 optical fabrication 220.4840 Testing

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Reflectionless spatial beam benders with arbitrary bending angle by introducing optic-null medium into transformation optics

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Chinese Physics B 2021年第3期30卷 242-247页

作者： Fei Sun Yi-Chao Liu Yi-Biao Yang Hong-Ming Fei Zhi-Hui Chen Sai-Ling He Key Laboratory of Advanced Transducers and Intelligent Control System Ministry of Education and Shanxi ProvinceCollege of Physics and OptoelectronicsTaiyuan University of TechnologyTaiyuan 030024China National Engineering Research Center for Optical Instruments Center for Optical and Electromagnetic ResearchZhejiang UniversityHangzhou 310058China

By introducing an optic-null medium into the finite embedded transformation,a reflectionless spatial beam bender is designed,which can steer the output beam by a fixed pre-designed angleβfor an arbitrary incident *** bending angleβof the beam bender is determined by the geometrical angle of the device,which can be changed by simply choosing different geometrical *** various bending angles,the designed spatial beam bender can be realized by the same materials(i.e.,an optic-null medium),which is a homogenous anisotropic *** simulations verify the reflectionless bending effect and rotated imaging ability of the proposed beam bender.A reduction model of the optic-null medium is studied,which can also be used for a reflectionless spatial beam bender with a pre-designed bending angle.

关键词： spatial beam benders optic-null medium transformation optics

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Reversible Data Hiding Based on Pixel-Value-Ordering and Pixel Block Merging Strategy

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Computers, Materials & Continua 2019年第6期59卷 925-941页

作者： Wengui Su Xiang Wang Yulong Shen College of Computer Science and Technology Xidian UniversityXi’an710071China Guangxi Key Laboratory of Manufacturing System&Advanced Manufacturing Technology College of Mechanical EngineeringGuangxi UniversityNanning530004China College of Telecommunications Engineering Xidian UniversityXi’an710071China

With the reversible data hiding method based on pixel-value-ordering,data are embedded through the modification of the maximum and minimum values of a block.A significant relationship exists between the embedding performance and the block *** pixel-value-ordering methods utilize pixel blocks with a fixed size to embed data;the smaller the pixel blocks,greater is the embedding ***,it tends to result in the deterioration of the quality of the marked ***,a novel reversible data hiding method is proposed by incorporating a block merging strategy into Li et al.’s pixel-value-ordering method,which realizes the dynamic control of block size by considering the image ***,the cover image is divided into non-overlapping 2×2 pixel ***,according to their complexity,similarity and thresholds,these blocks are employed for data embedding through the pixel-value-ordering method directly or after being emerged into 2×4,4×2,or 4×4 sized ***,smaller blocks can be used in the smooth region to create a high embedding capacity and larger blocks in the texture region to maintain a high peak signal-to-noise *** results prove that the proposed method is superior to the other three advanced *** achieves a high embedding capacity while maintaining low distortion and improves the embedding performance of the pixel-value-ordering algorithm.

关键词： Reversible data hiding pixel-value-ordering prediction error expansion dynamic block partition

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The inverse kinematics solutions of robot manipulators with offset wrist using the offset modification method

The inverse kinematics solutions of robot manipulators with ...

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2011 International Conference on Automation and Robotics, ICAR 2011

作者： Pan, Haihong Fu, Bing Chen, Lin Feng, Junjie Guangxi Key Laboratory of Manufacturing System and Advanced Manufacturing Technology School of Mechanical Engineering Guangxi University Nanning Guangxi 530004 China

ISBN: (纸本)9783642255526

It is no closed-form solutions for 6R robot manipulators without three consecutive joint axes parallel or three adjacent joint axes intersected a common point. In this paper, the offset modification (OM) method was applied to solve the inverse kinematics problem of these types of manipulators which didn't have closed-form solutions. A robot manipulator model of TA1400 with offset wrist was built by the OM method. And then three nonlinear equations were derived from the difference between the forward kinematics equations of the model robot manipulator and the TA1400 manipulator. Eight sets of inverse kinematics solutions of TA1400 were obtained by the three nonlinear equations with the fixed-point and the Steffensen iterative method. The results show that the orientation errors of the eight sets of solutions are all less than 10 -15 and the position errors are less than 10-4 mm, which meet the requirements of the industrial robot's positions and orientations precision. The assembly experiments of TA1400 in ADAMS show that curve of each joint angle are smooth and continuous using the OM method. These results and experiments proved that the offset modification method can be applied to solve the inverse kinematics of industrial robot manipulators with front offset wrists. © 2011 Springer-Verlag.

关键词： Nonlinear equations

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Design of dispersive objective lens of spectral confocal displacement sensor 2

Design of dispersive objective lens of spectral confocal dis...

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2nd IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021

作者： Xie, Zhenhao Liu, Ruoxu Zou, Kuaisheng Zhou, Jiankang Soochow University School of Optoelectronic Science and Engineering Suzhou China Key Laboratory of Advanced Optical Manufacturing Technology of Jiangsu Province Key Laboratory of Modern Optical Technology of Ministry of Education Suzhou China

ISBN: (纸本)9781728190181

According to the working principle of the spectral confocal displacement sensor, four kinds of glass materials SKIO, H-ZLAF52A, N-LAK34 and SFL6 for dispersive lens are selected. 4 single lenses and one doublet lens are components of the initial structure of the linear dispersion objective lens. optical design software is used to optimize the tolerance of the initial structure of the dispersive objective lens. The results show that the spot diagram of each wavelength is much smaller than the Airy disk. in the wavelength range of 450-700nm, the measurement range of the dispersive objective lens can reach 3.454 mm, and the linear determination coefficient R2 between the axial dispersion diatance and the wavelength is 0.972. © 2021 IEEE.

关键词： Dispersion (waves)

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Design of dispersive module for a 3D object shape detection device 2

Design of dispersive module for a 3D object shape detection ...

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2nd IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021

作者： Liu, Ruoxu Xie, Zhenhao Zou, Kuaisheng Zhou, Jiankang Soochow University School of Optoelectronic Science and Engineering Suzhou China Key Laboratory of Advanced Optical Manufacturing Technology of Jiangsu Province Key Laboratory of Modern Optical Technology of Ministry of Education Suzhou China

ISBN: (纸本)9781728190181

Confocal line spectroscopy is proposed for obtaining the three-dimensional shape detection of microscopic objects. An off-axis spectral confocal technology composed of TIR lens, PGP beam splitter and cylindrical lens. The design results show that the PGP dispersive device achieves the linearity of dispersion, and the focal plane formed by this scheme has a working distance of 6.92mm on the z-axis, corresponding to the wavelength range of 450nm-700nm, that is, 27.68 mu m/nm (1nm wavelength is corresponding to 27.68 microns);At the same time, the focal plane is 20mm long and 6.92mm deep, with the one-dimensional movement of the object, the three-dimensional shape information of the object can be obtained. © 2021 IEEE.

关键词： Object detection

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Study on refractive index distribution measurement of self-focusing lens with mach-zehnder interferometry 2

Study on refractive index distribution measurement of self-f...

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2nd IEEE Asia-Pacific Conference on Image Processing, Electronics and Computers, IPEC 2021

作者： Sun, Peng Xu, Feng Zou, Kuaisheng Ma, Suodong Soochow University School of Optoelectronic Science and Engineering Suzhou China Key Laboratory of Advanced Optical Manufacturing Technology of Jiangsu Province Key Laboratory of Modern Optical Technology of Ministry of Education Suzhou China

ISBN: (纸本)9781728190181

In this paper, a Mach-Zehnder Interferometry is designed and setup to measure the refractive index of a self-focusing lens. Interference fringe patterns with different ion exchange degrees are investigated and simulated at first. Experimental interference fringe patterns are collected and analyzed by Matlab. The refractive index distribution curve of the self-focusing lens is finally obtained to easily assess the ion exchange status. © 2021 IEEE.

关键词： Ion exchange

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Design and preparation of a large size laser protective coating for solar arrays on spacecrafts

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Chinese Optics Letters 2014年第A1期12卷 169-171页

作者：申振峰 Key Laboratory of Optical System Advanced Manufacturing Technology Changehun Institute of Optics Fine Mechanics and Physics Chinese Academy of Sciences Changchun 130033 China

In this letter, we introduce the project of multilayer dielectric fihn based on conventional optics to design laser-protective coating. A desired material with an ideal refractive index is used to optimize the design results. Two film-thickness masks are designed to improve the uniformity of large-size coatings. Experimental results show that the average spectral transmittance from 400 to 1000 nm is higher than 85%, the attenuation of high-energy laser at both 532 and 1064 nm is larger than 98% in the range of ±20°, and the film uniformity of large area is more than 98.2%. The coating performance observed meets the requirements of both utilization of solar energy and laser protection.

关键词： 350.1260 Astronomical optics

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A Survey of Underwater Multi-Robot systems

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IEEE/CAA Journal of Automatica Sinica 2022年第1期9卷 1-18页

作者： Ziye Zhou Jincun Liu Junzhi Yu State Key Laboratory for Turbulence and Complex System Department of Advanced Manufacturing and RoboticsBeijing Innovation Center for Engineering Science and Advanced TechnologyCollege of EngineeringPeking UniversityBeijing 100871China College of Information and Electrical Engineering China Agricultural UniversityBeijing 100083China

As a cross-cutting field between ocean development and multi-robot system(MRS),the underwater multi-robot system(UMRS)has gained increasing attention from researchers and engineers in recent *** this paper,we present a comprehensive survey of cooperation issues,one of the key components of UMRS,from the perspective of the emergence of new *** specifically,we categorize the cooperation in terms of task-space,motion-space,measurement-space,as well as their ***,we analyze the architecture of UMRS from three aspects,i.e.,the performance of the individual underwater robot,the new functions of underwater robots,and the technical approaches of *** conclude,we have discussed related promising directions for future *** survey provides valuable insight into the reasonable utilization of UMRS to attain diverse underwater tasks in complex ocean application scenarios.

关键词： Cooperation formation control multi-robot systems(MRS) taxonomy underwater robots underwater tasks

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The alignment and imaging experiment of a telescope with wavefront coding technology

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Chinese Optics Letters 2014年第A1期12卷 132-134页

作者：闫锋 Key Laboratory of Optical System Advanced Manufacturing Technology Changchun Institute of Optics Fine Mechanics and Physics Chinese Academy of Science Changchun 130033 China

Wavefront coding （WFC） is kind of computational imaging technique that controls misfocus and misfocusrelated aberrations of optical systems by appending a specially designed phase distribution to the pupil function. This technology has been applied in many fields to increase the performance or/and reduce the cost of imaging systems. The application of WFC technology on an off-axis three-mirror anastigmatic （TMA） system has been proposed in our previous work. In this letter, we describe the alignment, the imaging experiment and image restoration of an actual TMA system with WFC technology.

关键词： 220.1140 Alignment 100.3020 Image reconstruction-restoration 110.1758 Computational imaging

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